David H.
Google
A great knife shop located in the bustling shopping district around Mitsukoshi-mae Station. You can find all different kinds of cooking knives here, in addition to some woodworking tools and shaving razors.
I purchased two Damascus-steel knives from them 7 years ago, and both have held up beautifully.
Besides their goods, they also offer a knife sharpening service.
Although not cheap, if you buy a knife from here you're investing in a tool that you could be using for decades.